package com.atguigu.spzx.manager.service.impl;


import com.alibaba.excel.EasyExcel;
import com.atguigu.spzx.common.exception.GuiguException;
import com.atguigu.spzx.manager.listener.ExcelListener;
import com.atguigu.spzx.manager.mapper.CategoryMapper;
import com.atguigu.spzx.manager.service.CategoryService;
import com.atguigu.spzx.model.entity.product.Category;
import com.atguigu.spzx.model.vo.common.ResultCodeEnum;
import com.atguigu.spzx.model.vo.product.CategoryExcelVo;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.web.multipart.MultipartFile;

import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
public class CategoryServiceImpl implements CategoryService {
    @Autowired
    private CategoryMapper categoryMapper;
    @Override
    public List<Category> findCategoryList(Long id) {
        // 根据id条件值进行查询，返回list集合

        // select * from category where parent_id = id

        List<Category> categoryList = categoryMapper.selectCategoryByParentId(id);

       // 遍历完返回list集合
      // 判断每个分类是否有下一层分类，如果有设置 hasChildren = true
      if (!CollectionUtils.isEmpty(categoryList)) {
          categoryList.forEach(category -> {
              // 判断每个分类是否有下一层分类
              int count = categoryMapper.selectCountByParentId(category.getId());
              if (count > 0) { // 下一层分类
                  category.setHasChildren(true);
              } else {
                  category.setHasChildren(false);
              }
          });

      }

      return  categoryList;

    }

    @Override
    public void exportData(HttpServletResponse response) {
        try {
            // 1.设置响应头信息和其他信息
            // 设置响应结果类型
            response.setContentType("application/vnd.ms-excel");
            response.setCharacterEncoding("utf-8");
            // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
            String fileName = URLEncoder.encode("分类数据", "UTF-8");

            // 设置响应头信息
            response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");

            // 2. 调用mapepr方法查询所有分类 返回list集合
            List<Category> categoryList = categoryMapper.findAll();
            List<CategoryExcelVo> categoryExcelVoList = new ArrayList<>(categoryList.size());

            for (Category category : categoryList) {
                CategoryExcelVo categoryExcelVo = new CategoryExcelVo();
                BeanUtils.copyProperties(category, categoryExcelVo,CategoryExcelVo.class);
                categoryExcelVoList.add(categoryExcelVo);
            }

            // 3. 调用Easyexcel的write方法完成操作
            EasyExcel.write(response.getOutputStream(), CategoryExcelVo.class).sheet("分类数据").doWrite(categoryExcelVoList);

        } catch (Exception e) {
            e.printStackTrace();
            throw new GuiguException(ResultCodeEnum.DATA_ERROR);
        }
    }

    @Override
    public void importData(MultipartFile file) {
        // 导入
        try {
            ExcelListener<CategoryExcelVo> excelListener = new ExcelListener(categoryMapper);
            // 调用read方法读取excel数据
            EasyExcel.read(file.getInputStream(), CategoryExcelVo.class, excelListener).sheet().doRead();
        } catch (Exception e) {
            e.printStackTrace();
            throw new GuiguException(ResultCodeEnum.DATA_ERROR);
        }
    }
}
